SeaORM — Async Dynamic ORM for Rust

Introduction

SeaORM provides Rust developers with a full-featured ORM that embraces async-first design and works with the major async runtimes (Tokio, async-std). Unlike raw SQL or lightweight query builders, SeaORM gives you typed entities, relationship definitions, and a migration framework while keeping the flexibility to drop into raw queries when needed.

What SeaORM Does

• Maps database tables to Rust structs with derive macros for type-safe column access
• Supports async queries on MySQL, PostgreSQL, and SQLite through the SQLx or rbatis backend
• Provides a migration framework for versioned schema changes written in Rust
• Generates entity code from existing databases with the sea-orm-cli tool
• Handles relationships (one-to-one, one-to-many, many-to-many) with lazy and eager loading

Architecture Overview

SeaORM is layered on top of SeaQuery, a query builder that generates database-specific SQL. Entity definitions are Rust structs with derive macros that describe table schemas. At runtime, SeaORM compiles queries through SeaQuery, executes them via an async database driver (SQLx by default), and deserializes results into entity structs. The connection pool is managed by the underlying driver, and transactions are supported with async closures.

Self-Hosting & Configuration

• Add sea-orm as a Cargo dependency with feature flags for your database and async runtime
• Use sea-orm-cli to scaffold migrations and generate entities from existing schemas
• Configure the database URL via environment variable or application config
• Enable logging with the debug-print feature to see generated SQL during development
• Deploy as part of any Rust binary; no separate server or runtime needed

Key Features

• Fully async with support for Tokio and async-std runtimes
• Dynamic queries allow building WHERE clauses conditionally at runtime
• Seaography integration for automatic GraphQL API generation from SeaORM entities
• Mock database support for unit testing without a live database connection
• Active Model pattern for partial updates that only touch changed columns

Comparison with Similar Tools

• Diesel — Compile-time query verification with strong types; synchronous only and no runtime query building
• SQLx — Compile-time checked raw SQL; more control but no ORM features like relations or migrations
• GORM (Go) — Similar ORM pattern for Go; SeaORM brings the same convenience to Rust with async support
• Prisma — TypeScript ORM with schema-first design; SeaORM is native Rust with no external process

FAQ

Q: Is SeaORM production-ready? A: Yes. SeaORM has stable releases and is used in production Rust applications including web services and CLI tools.

Q: Can I use raw SQL with SeaORM? A: Yes. You can execute raw SQL queries and map results to custom structs or entity models.

Q: How does SeaORM handle database migrations? A: The sea-orm-cli provides a migration framework where each migration is a Rust file with up and down functions, applied in version order.

Q: Does it support connection pooling? A: Yes. Connection pooling is handled by the underlying SQLx driver with configurable pool size and timeouts.

Sources

• https://github.com/SeaQL/sea-orm
• https://www.sea-ql.org/SeaORM/docs/